In corn, genes for tassel length (alleles T and t) and rust resistance (alleles R and r) are known to be on separate chromosomes, and all combinations of alleles are equally viable.

A breeder crossed true-breeding T/TR/R plants with true-breeding t/tr/ plants to generate heterozygous F ₁ plants. When back-crossing these F ₁ plants as female parents to the homozygous recessive strain as a male (pollen) parent, the breeder noticed that one F ₁  plant gave unexpected results. There were only half as many kernels as usual on the corn cobs, and the phenotypes of plants grown from those kernels indicated they had the following genotypes in the numbers indicated below.

Briefly describe the chromosomes bearing these two genes in the unusual F ₁ plant.

Transcribed Image Text:

Genotype #3 T/t R/r 98 t/t r/r 104 T/t r/r 3 t/t R/r 5 Genotype #3 T/t R/r 98 t/t r/r 104 T/t r/r 3 t/t R/r 5

Answer rating: 100% (QA)

SOLUTION The lower number represents the recombinant off... View the full answer